merge: reconcile with feature/trc20-tron-send into one combined branch

Bitcoin was branched off main independently instead of continuing on top
of the Tron send branch, which caused real divergence: both branches touch
the same shared signing/DI code (multiChainEncryptionFor, getMetaAccountKeypair,
NodeHealthStateTesterFactory, AssetsModule/TypeBasedAssetSourceRegistry,
CloudBackup schema, Fee model), and both need to ship together in one
coordinated release once wallet-util's master is unblocked. Merging now
reconciles that before it gets any harder, and gives one branch/versionCode
history for device testing instead of two that silently diverge.

Conflict resolutions of note:
- SecretStoreV2/SecretsSigner: getKeypair and multiChainEncryptionFor now
  recognize Tron AND Bitcoin accounts (isTronBased/isBitcoinBased both
  threaded through, checked before the Ethereum fallback).
- AccountDataSourceImpl: both address-backfill migrations now run
  sequentially in one coroutine (Tron's fix for a race against the legacy
  migration applies equally to Bitcoin's backfill).
- CloudBackup: kept Tron's forward-looking Solana schema reservation
  alongside Tron's and Bitcoin's now-real fields.
- ChainRegistryModule/NodeHealthStateTesterFactory: adopted Tron's
  self-contained short-lived OkHttpClient (simpler than threading the
  shared app-wide client through RuntimeDependencies, which is reverted).
- RealSecretsMetaAccount: extended Tron's chain-account MultiChainEncryption
  fix to also cover Bitcoin, for the same underlying reason.
- ChainExt.isValidAddress: Tron's branch independently closed the
  pre-existing Tron validation gap; kept alongside Bitcoin's own check.

feature-wallet-api/src/main/java/io/novafoundation/nova/feature_wallet_api/data/network/blockhain/assets/tranfers/TransactionExecution.kt

@@ -10,4 +10,6 @@ sealed interface TransactionExecution {
     class Substrate(val extrinsicExecutionResult: ExtrinsicExecutionResult) : TransactionExecution
 
     class Bitcoin(val hash: String) : TransactionExecution
+
+    class Tron(val hash: String) : TransactionExecution
 }